Study coauthor Richard Ryan - “When people feel they have no control over the outcome of a game, that leads to aggression...If you press someone’s competencies, they’ll become more aggressive, and our effects held up whether the games were violent or not.”

Excerpt from the report - "The evidence clearly shows that the shooter planned his actions, including the taking of his own life, but there is no clear indication why he did so, or why he targeted Sandy Hook Elementary School. It is known that the shooter had significant mental health issues that affected his ability to live a normal life and to interact with others, even those to whom he should have been close."